This little waterproof light can clip to your PFD while you're paddling so you're more visible in low light. It has 3 modes from bright to flashing SOS and has directional and omni-directional (visible from all sides) light.  It operates on 2 CR2032 battery cells (included) and comes with a Fox 40 Micro pealess whistle that will work underwater.

Modes: on, 50% on, flashing (SOS)
Waterproof rating: IPX4